// Copyright 2023 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package collector

import (
	"context"

	"github.com/prometheus/client_golang/prometheus"
)

// wrapCollector is a util to let you test your Collector implementation.
//
// Use this with prometheus/client_golang/prometheus/testutil to test metric output, for example:
//
//	testutil.CollectAndCompare(wrapCollector{c}, strings.NewReader(want))
type wrapCollector struct {
	c Collector
}

func (w wrapCollector) Describe(_ chan<- *prometheus.Desc) {
}

func (w wrapCollector) Collect(ch chan<- prometheus.Metric) {
	w.c.Update(context.Background(), ch)
}
